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Full Discussion: Bash Lockfile Command
Top Forums Shell Programming and Scripting Bash Lockfile Command Post 302802261 by Reshu289 on Friday 3rd of May 2013 07:27:17 AM
Old 05-03-2013
Bash Lockfile Command

Hi,

I am new to this forum, could any one please help me to understand the LOCKFILE command with an example and what exactly it is used for and how it is used.

Thanks
Reshu289
 

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Paranoid::Lockfile(3pm) 				User Contributed Perl Documentation				   Paranoid::Lockfile(3pm)

NAME
Paranoid::Lockfile - Paranoid Lockfile support VERSION
$Id: Lockfile.pm,v 0.65 2011/12/08 07:53:07 acorliss Exp $ SYNOPSIS
use Paranoid::Lockfile; $rv = plock($lockfile); $rv = punlock($lockfile); $rv = pcloseLockfile($lockfile); DESCRIPTION
This modules provides a relatively safe locking mechanism across multiple processes. This does not work over NFS or across remote systems, this is only intended for use on a single system at a time, and only on those that support flock. sysopen is used to avoid race conditions with multiple process attempting to create the same file simultaneously. SUBROUTINES
/METHODS plock $rv = plock($filename); This function attempts to safely create or open the lockfile. It uses sysopen with O_CREAT | O_EXCL to avoid race conditions with other processes. Returns a true if successful. Your can pass an optional second argument which would be a string of either 'write' or 'shared'. The default is 'write', which locks the file in exclusive write mode. You can pass an optional third argument which would be the lockfile filesystem permissions if the file is created. The default is 0600. NOTE: This function will block until the advisory lock is granted. punlock $rv = punlock($filename); This function removes any existing locks on the specified filename using flock. If no previous lock existed or it was successful it returns true. This does not, however, close the open filehandle to the lockfile. pcloseLockfile $rv = pcloseLockfile($filename); This function releases any existing locks and closes the open filehandle to the lockfile. Returns true if the file isn't currently open or the operation succeeds. DEPENDENCIES
o Fcntl o Paranoid o Paranoid::Debug BUGS AND LIMITATIONS
AUTHOR
Arthur Corliss (corliss@digitalmages.com) LICENSE AND COPYRIGHT
This software is licensed under the same terms as Perl, itself. Please see http://dev.perl.org/licenses/ for more information. (c) 2005, Arthur Corliss (corliss@digitalmages.com) perl v5.14.2 2011-12-08 Paranoid::Lockfile(3pm)
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